WW2 German soldiers would listen for that ringing sound. It told them that the enemy had run out of bullets, but the American soldiers found out they could mimic the sound by tapping the clip against their helmet...
1. You can also create the sound by throwing an empty clip on the hard ground or a rock.
2. You need to try to not be reloading at the same time as your partners.
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2. You need to try to not be reloading at the same time as your partners.